|There's no way you're gonna get away cheaply. If you're willing to build an i7 system in the 1st place, I can't see how the cost of a board is gonna kill your plan.|
The 920 will set you back close to $300 & as for the board, the only ones currently available are based on the X58 & they're ALL fairly expensive. That's to be expected with bleeding edge hardware. The cheapest I saw at Newegg was a Gigabyte for $185 after rebate. And RAM will cost you at least $100 for a 6GB triple channel kit (IMO, a 3GB triple channel kit would be a waste of money). However, to take advantage of the 6GB, you'd need to run a 64-bit OS.
So you'd be looking at approx $575 just for the board/CPU/RAM, then you gotta tack on the video card & whatever else you may need to complete the build. Since you already have a Q6600 system, why build a Core i7 at this point in time? Bragging rights?